this is a serious topic i am up grading the wheels and fitting light weight carbon wheels i know this is extreme but i am not wasting the 50 pound i spent on the dog i hav had this dog from it was 9 year old and its now coming 10 so it means alot to me.so money is no object as long as it is within what i recieve on my benefits and leaves me enough to do me to feed my 8 kids and wifes then its ok.ps how fast does a mobility scooter go as the dog is lacking stamina and cant run more than an hour a nite and thought the engine would give it the edge